| 摘要 |
The invention relates to a steel for the production of submarine hulls having the chemical composition: 0.030%≦̸C<0.080% 0.040%≦̸Si≦̸0.48% 0.1%≦̸Mn≦̸1.4% 2%≦̸Ni≦̸4% Cr≦̸0.3% 0.30%≦̸Mo+W/2+3(V+Nb/2+Ta/4)≦̸0.89% Mo≧0.15% V+Nb/2+Ta/4≦̸0.004% Nb≦̸0.004% Cu≦̸0.45% Al≦̸0.1% Ti≦̸0.04% N≦̸0.0300% the balance being iron and impurities resulting from the production operation, boron being an impurity whose content is less than 0.0005%, and P+S≦̸0.015%, the chemical composition complying with the condition: 410≦̸540×C0.25+245[Mo+W/2+3(V+Nb/2+Ta/4)]0.30≦̸460. |
